didisheim



'2 Sh'eet's-Sheet 1.

(No Model.)

A. DIDISHEIM.

STOP WATGH No. 466,558. Pgtented Jan. 5', 1892.

.2 Sheets-.Sheet 2.

Patented Jan. 5, 1 892.

UNITED STATES PATENT QFFICE.

ARTHUR DIDISHEIM, OF UHAUX-DE-FONDS, SWITZERLAND.

STOP-WATCH SPECIFICATION forming part of Letters Patent No. 466,558, dated January 5, 1892. Application filed September 24, 1891.. Serial No- 406,638. (No model.) Patented in Switzerland May 28, 1891,1T0. 3,451.

To all whom, it may concern.-

Be it known that I, ARTHUR DIDISHEIM, watch manufacturer, of Ohaux de Fonds, Switzerland, have in vented an Improved Stop- Watch, (for which I have obtained Letters Patent in Switzerland, numbered 3,451 and dated May 28, 1891,) of which the following is a specification.

The invention consists of an-improved stopwatch and in the construction and combination of parts and details, as will be fully described and set forth hereinafter, and pointed out in the claims.

My improved stop-watch is provided with a seconds-hand, which is alternately rotated by means of one of the gears of the watch-movement and of a reciprocating intermediatewheel stopped and replaced on its startingpoint. The three functions are obtained by means of only one rocking lever, having one of its ends projecting out of the watch-case and provided with a suitable head-piece to be acted upon by hand. The mechanism is disposed so as to allow the seconds-hand to start from the point where it has been stopped without previously replacing the same to zero.

In the accompanying drawings, Figure 1 is a front view of my improved stop -watch. Fig. 2 is a plan view of the stop-watch mechanism as it is to be seen when removed out of the case and going. Fig. 3 is a similar view of said mechanism when stopped. Fig. 4 is a similar view of said mechanism when at rest, the seconds-hand being set to zero.

In all the figures the same letters refer t the same pieces.

The gears of the watch-=movement'are not shown, the same being of any one of the well-known constructions used in ordinary watches.

A is a cog-wheel fixed on the axis of one of the gears of the watch-movement, preferably on the axis of the seconds-wheel.

B is a cog-wheel, the tubular axis of which bears the heart-piece or eccentric G and the seconds-hand D and is free to rotate on the tubular axis E of the hour-wheel. (Not shown.) .A friction-spring or brake-spring F bears against the cog-wheel B, so as to have the seconds-hand maintained in any place where it has been stopped until it is set to zero.

G is an intermediate wheel pivoted to a reciprocating bridge H and pressed into gear with both cog wheels A and B (see Fig. 2) by a spring I, fixed to the plate J. The rocking lever K ispivoted to the plate J by means of a disk j, screwed to said plate J, and has its end is projecting out of the watch and com bined with a head-piece K, sliding on the case when acted'upon by the finger. The lever K is furthermore provided with a notch into which the head of a spring L, fixed to the plate J, may be engaged, as shown in Fig. 3. A projection 70 is provided to act upon the eccentric or heart-piece O, and a bowed arm 10 with depression 70 upon which bears a pin h of the reciprocating bridge II.

When in the position shown in Fig. 2, the lever K is out of action and the head of the spring L bears on one side of the notch 70 If one then presses the end 70 in the direction indicated by an arrow in Fig. 2 until he feels a resistance, he will throw the lever K into the position shown in Fig. 3, the head of the spring L engaging the notch 70 of lever K. By this rocking of the lever K its bowed arm 10 causes the pin hof the reciprocating bridge H to be lifted so as to throw the intermediate wheel G out of gear of the central wheel B. This causes the seconds-hand to be stopped, said hand being held in its position by means of the spring F acting like a brake upon the wheel B. Now if one again presses the end 70' of lever K in the direction shown by an arrow in Fig. 3 the spring L will be forced out of the notch k and the projection R will fall upon the heart-piece 0, setting the seconds-hand D to zero, as shown in Fig. at. In the course of the j ustmentioned rocking movement of the lever K its bowed arm 70 slides against the pin h of the rocking bridge 1-1, which remains in its position. as shown in the Figs. 3 and 4, in which the seconds-hand is stopped, and will only assume the'position shown in Fig. 2, in which the seconds-hand is going, when the lever K is rocked from its position shown in Fig. 4 into that shown in Fig. 2.

I claim as my invention-- The combination, with the wheel B, heartcam O, and seconds-hand D, of the frictionspring F, bearing on the wheel B, the lever K, adapted to be acted upon by the finger heart-ca1n to restore the seconds-hand to the [O i normal position, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR DIDISIIEIM.

MAURICE RUOFF,

\Vitnesses: i HENRI OHoRPUE. 

